Plato seems to believe that the perfect life is led only under perfect conditions which is the perfect society within the perfect society there would have to be justice in the republic it seems that justice is defined many different ways. Thrasymachus' definition is the central challenge of the rest of the republic, as socrates tries to prove him wrong plato means for thrasymachus to seem foolish and unpleasant, and his demand for pay, customary for sophists, is a deliberate blot on his character.
Analysis the republic of plato is the longest of his works with the exception of the laws, the republic of plato is also the ﬁrst treatise upon education, of which the wri- the argument of the republic is the search after justice, the nature of which is.
One of plato's recurring techniques in the republic is to refine the concept of justice with reference to various examples of greater or lesser injustice however, in the concept of injustice ,  eric heinze challenges the assumption that 'justice' and 'injustice' form a mutually exclusive pair. The republic is arguably the most popular and most widely taught of plato's writings although it contains its dramatic moments and it employs certain literary devices, it is not a play, a novel, a story it is not, in a strict sense, an essay.
Plato’s strategy in the republic is to first explicate the primary notion of societal, or political, justice, and then to derive an analogous concept of individual justice in books ii, iii, and iv, plato identifies political justice as harmony in a structured political body. Some think that plato does not intend the republic as a serious contribution to political thought, because its political musings are projections to clarify psychological claims crucial to the ethical theory that plato does seriously intend (annas 1999, annas 2000) others think that plato intends political lessons strikingly different from what is suggested by the face value of socrates’ words.
On the necessity of justice: an analysis of plato's republic devin pratt #0131759 january 28, 2003 phil 210 prepared for: david morris on the necessity of justice - an analysis of plato's republic the central theme of plato's republic is the question of whether it is better to govern oneself justly, or to behave unjustly. Justice, therefore, is the citizen sense of duties justice is, for plato, at once a part of human virtue and the bond, which joins man together in society it is the identical quality that makes good and social justice is an order and duty of the parts of the soul, it is to the soul as health is to the body.
Justice in plato's the republic ralph waldo emerson once wrote “one man’s justice is another’s injustice” this statement quite adequately describes the relation between definitions of justice presented by polemarchus and thrasymachus in book i of the republic.